Effect of composition of La0.8Sr0.2MnO3-Y2O 3-stabilized ZrO2 cathodes. Correlating three-dimensional microstructure and polarization resistance

James R. Wilson; J. Scott Cronin; Anh T. Duong; Sherri Rukes; Hsun Yi Chen; Katsuyo Thornton; Daniel R. Mumm; Scott Barnett

doi:10.1016/j.jpowsour.2009.09.074

Effect of composition of La_0.8Sr_0.2MnO₃-Y₂O ₃-stabilized ZrO₂ cathodes. Correlating three-dimensional microstructure and polarization resistance

James R. Wilson, J. Scott Cronin, Anh T. Duong, Sherri Rukes, Hsun Yi Chen, Katsuyo Thornton, Daniel R. Mumm, Scott Barnett^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

151 Scopus citations

Abstract

Composite La_0.8Sr_0.2MnO₃ (LSM)-Y₂O₃-stabilized ZrO₂ (YSZ) cathodes with compositions ranging from 30:70 to 70:30 wt.% LSM:YSZ were studied both electrochemically and microstructurally. Polarization resistance was lowest for the 50 wt.% YSZ composition, and increased symmetrically as the composition deviated from this value. Serial-sectioning using focused ion beam-scanning electron microscopy was implemented to reconstruct the three-dimensional cathode microstructure. Various averaged structural parameters were determined versus composition, including phase volume fractions, surface area densities, total triple-phase boundary (TPB) densities, interfacial curvatures, phase tortuosities, and the levels of phase connectivity. Typically >90% of the pore and YSZ networks were found to be intra-connected to the surrounding phase, but the LSM networks showed lower connected fractions, as low as 37.5% for a LSM weight fraction of 30%. The composition dependences of the total TPB density and electrochemically-active TPB density (i.e., TPB's on three fully intra-connected phases) were shown to agree reasonably well with simple "sphere-packing" structural models. An electrochemical model that accounted for the linear-specific resistance of TPB's, phase intra-connectivity, and oxygen ion transport in the YSZ as influenced by its tortuosity, was found to provide reasonable agreement with the measured polarization resistance versus composition.

Original language	English (US)
Pages (from-to)	1829-1840
Number of pages	12
Journal	Journal of Power Sources
Volume	195
Issue number	7
DOIs	https://doi.org/10.1016/j.jpowsour.2009.09.074
State	Published - Apr 2 2010

Funding

The authors gratefully acknowledge the financial support of the National Science Foundation Ceramics program through grants DMR-0542740 (Northwestern Univ.) and 0645812 (UC-Irvine). The authors also acknowledge the use of the facilities within the Carl Zeiss Center of Excellence at the University of California, Irvine as well as Marcio Gameiro for his work involving the connectivity calculations.

Keywords

Cathodes
Focused ion beam (FIB) tomography
Solid oxide fuel cells
Three-dimensional (3D) microstructure

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jpowsour.2009.09.074

Cite this

@article{ac31e493c21c411ba2a1ffc749dcf482,

title = "Effect of composition of La0.8Sr0.2MnO3-Y2O 3-stabilized ZrO2 cathodes. Correlating three-dimensional microstructure and polarization resistance",

abstract = "Composite La0.8Sr0.2MnO3 (LSM)-Y2O3-stabilized ZrO2 (YSZ) cathodes with compositions ranging from 30:70 to 70:30 wt.% LSM:YSZ were studied both electrochemically and microstructurally. Polarization resistance was lowest for the 50 wt.% YSZ composition, and increased symmetrically as the composition deviated from this value. Serial-sectioning using focused ion beam-scanning electron microscopy was implemented to reconstruct the three-dimensional cathode microstructure. Various averaged structural parameters were determined versus composition, including phase volume fractions, surface area densities, total triple-phase boundary (TPB) densities, interfacial curvatures, phase tortuosities, and the levels of phase connectivity. Typically >90% of the pore and YSZ networks were found to be intra-connected to the surrounding phase, but the LSM networks showed lower connected fractions, as low as 37.5% for a LSM weight fraction of 30%. The composition dependences of the total TPB density and electrochemically-active TPB density (i.e., TPB's on three fully intra-connected phases) were shown to agree reasonably well with simple {"}sphere-packing{"} structural models. An electrochemical model that accounted for the linear-specific resistance of TPB's, phase intra-connectivity, and oxygen ion transport in the YSZ as influenced by its tortuosity, was found to provide reasonable agreement with the measured polarization resistance versus composition.",

keywords = "Cathodes, Focused ion beam (FIB) tomography, Solid oxide fuel cells, Three-dimensional (3D) microstructure",

author = "Wilson, {James R.} and Cronin, {J. Scott} and Duong, {Anh T.} and Sherri Rukes and Chen, {Hsun Yi} and Katsuyo Thornton and Mumm, {Daniel R.} and Scott Barnett",

note = "Funding Information: The authors gratefully acknowledge the financial support of the National Science Foundation Ceramics program through grants DMR-0542740 (Northwestern Univ.) and 0645812 (UC-Irvine). The authors also acknowledge the use of the facilities within the Carl Zeiss Center of Excellence at the University of California, Irvine as well as Marcio Gameiro for his work involving the connectivity calculations. ",

year = "2010",

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doi = "10.1016/j.jpowsour.2009.09.074",

language = "English (US)",

volume = "195",

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TY - JOUR

T1 - Effect of composition of La0.8Sr0.2MnO3-Y2O 3-stabilized ZrO2 cathodes. Correlating three-dimensional microstructure and polarization resistance

AU - Wilson, James R.

AU - Cronin, J. Scott

AU - Duong, Anh T.

AU - Rukes, Sherri

AU - Chen, Hsun Yi

AU - Thornton, Katsuyo

AU - Mumm, Daniel R.

AU - Barnett, Scott

N1 - Funding Information: The authors gratefully acknowledge the financial support of the National Science Foundation Ceramics program through grants DMR-0542740 (Northwestern Univ.) and 0645812 (UC-Irvine). The authors also acknowledge the use of the facilities within the Carl Zeiss Center of Excellence at the University of California, Irvine as well as Marcio Gameiro for his work involving the connectivity calculations.

PY - 2010/4/2

Y1 - 2010/4/2

N2 - Composite La0.8Sr0.2MnO3 (LSM)-Y2O3-stabilized ZrO2 (YSZ) cathodes with compositions ranging from 30:70 to 70:30 wt.% LSM:YSZ were studied both electrochemically and microstructurally. Polarization resistance was lowest for the 50 wt.% YSZ composition, and increased symmetrically as the composition deviated from this value. Serial-sectioning using focused ion beam-scanning electron microscopy was implemented to reconstruct the three-dimensional cathode microstructure. Various averaged structural parameters were determined versus composition, including phase volume fractions, surface area densities, total triple-phase boundary (TPB) densities, interfacial curvatures, phase tortuosities, and the levels of phase connectivity. Typically >90% of the pore and YSZ networks were found to be intra-connected to the surrounding phase, but the LSM networks showed lower connected fractions, as low as 37.5% for a LSM weight fraction of 30%. The composition dependences of the total TPB density and electrochemically-active TPB density (i.e., TPB's on three fully intra-connected phases) were shown to agree reasonably well with simple "sphere-packing" structural models. An electrochemical model that accounted for the linear-specific resistance of TPB's, phase intra-connectivity, and oxygen ion transport in the YSZ as influenced by its tortuosity, was found to provide reasonable agreement with the measured polarization resistance versus composition.

AB - Composite La0.8Sr0.2MnO3 (LSM)-Y2O3-stabilized ZrO2 (YSZ) cathodes with compositions ranging from 30:70 to 70:30 wt.% LSM:YSZ were studied both electrochemically and microstructurally. Polarization resistance was lowest for the 50 wt.% YSZ composition, and increased symmetrically as the composition deviated from this value. Serial-sectioning using focused ion beam-scanning electron microscopy was implemented to reconstruct the three-dimensional cathode microstructure. Various averaged structural parameters were determined versus composition, including phase volume fractions, surface area densities, total triple-phase boundary (TPB) densities, interfacial curvatures, phase tortuosities, and the levels of phase connectivity. Typically >90% of the pore and YSZ networks were found to be intra-connected to the surrounding phase, but the LSM networks showed lower connected fractions, as low as 37.5% for a LSM weight fraction of 30%. The composition dependences of the total TPB density and electrochemically-active TPB density (i.e., TPB's on three fully intra-connected phases) were shown to agree reasonably well with simple "sphere-packing" structural models. An electrochemical model that accounted for the linear-specific resistance of TPB's, phase intra-connectivity, and oxygen ion transport in the YSZ as influenced by its tortuosity, was found to provide reasonable agreement with the measured polarization resistance versus composition.

KW - Cathodes

KW - Focused ion beam (FIB) tomography

KW - Solid oxide fuel cells

KW - Three-dimensional (3D) microstructure

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